package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 验证码业务
     *
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result senCode(String phone, HttpSession session) {

        if (RegexUtils.isPhoneInvalid(phone)) {      //1.校验手机格式，符合/不符合
            return Result.fail("手机号格式错误！");
        }
        String code = RandomUtil.randomNumbers(6);//生成验证码
        //2.保存验证码到redis，
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //3.发送验证码
        log.debug("发送短信验证码成功,验证码:{}", code);
        //4.返回值：OK
        return Result.ok();
    }


    /**
     * 登录/注册业务
     *
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号和验证码
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) return Result.fail("手机号格式错误！");

        //1.2获取验证码并校验
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {//2.不一致报错
            return Result.fail("验证码错误");
        }
        //3.一致,查询用户是否已经注册，是/否 select * from tb_user where phone = ?
        User user = query().eq("phone", phone).one();

        //4否，创建用户并保存
        if (user == null) {
            user = createUserWithPhone(phone);
        }

        //5是，保持用户信息到redis
        //5.1随机生成32位数字字符token作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //5.2将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create().
                        setIgnoreNullValue(true).
                        setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //5.3往redis存储用户信息
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        //5.3.1设置token有效期
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //6返回token
        return Result.ok(token);
    }

    //用户签到：redis(key[ 前缀：用户：年：月：（offset）；  value：1/0)
    @Override
    public Result signIn() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyy:MM"));
        int dayOfMonth = now.getDayOfMonth();
        String key = "signIn:" + userId + keySuffix;

        //SETBIT key offset value
        stringRedisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    //本月截止今日连续签到统计
    @Override
    public Result signInCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyy:MM"));
        int dayOfMonth = now.getDayOfMonth();
        String key = "signIn:" + userId + keySuffix;

        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) Result.ok(0);
        Long num = result.get(0);
        if (num == null || num == 0) Result.ok(0);

        int count = 0;//计数器
        while (true) {
            if ((num & 1) == 0) {
                break;
            }else {
                count++;
            }
            num >>>= 1;
        }

        return Result.ok(count);
    }


    private User createUserWithPhone(String phone) {
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomNumbers(10));
        //2.保存用户
        save(user);
        return user;
    }
}
